It's kinda like a morph, but it's really not that. It's part dynamics tool and part vocoder, but you won't use it for either of those things. It's officially a modulation plugin, but that doesn't even begin to explain what it actually does.
Envy is really a toolkit for generating unique new material, adding textures to real world recordings or mutilating sounds to create crazy sci-fi elements. It can fit a wind recording into a machine gun, add wood to foley feet, it can superimpose a drum pattern on a vacuum cleaner, or pitch dive a vocal 6 octaves just for kicks.
Home Page -

https://www.thecargocult.nz/products/envy